Ferromagnetism and giant magnetoresistance in the rare earth fullerides Eu6-xSrxC60

Details Ferromagnetism and giant magnetoresistance in the rare earth fullerides Eu6-xSrxC60 Ferromagnetism and giant magnetoresistance in the rare earth fullerides Eu6-xSrxC60

2002-02-05

arxiv.org/abs/cond-mat/0202066v1

Phys. Rev. B 65, 134431 (2002)

Physics

Condensed Matter

Materials Science

5 pages, 4 figures

Scientific paper

10.1103/PhysRevB.65.134431

We have studied crystal structure, magnetism and electric transport properties of a europium fulleride Eu6C60 and its Sr-substituted compounds, Eu6-xSrxC60. They have a bcc structure, which is an isostructure of other M6C60 (M represents an alkali atom or an alkaline earth atom). Magnetic measurements revealed that magnetic moment is ascribed to the divalent europium atom with S = 7/2 spin, and a ferromagnetic transition was observed at TC = 10 - 14 K. In Eu6C60, we also confirm the ferromagnetic transition by heat capacity measurement. The striking feature in Eu6-xSrxC60} is very large negative magnetoresistance at low temperature; the resistivity ratio \rho(H = 9 T)/\rho(H = 0 T) reaches almost 10^{-3} at 1 K in Eu6C60. Such large magnetoresistance is the manifestation of a strong pi-f interaction between conduction carriers on C60 and 4f electrons of Eu.

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